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Public water system record

Dedham Westwood Water Dist.

Serves an area of Norfolk County, MA that includes Dedham · 41,630 people served

Federal records show 1 health-based violation and no monitoring/reporting issues for Dedham Westwood Water Dist. in the last ten years. The most serious issue in this window was a resolved Total Trihalomethanes (TTHMs) violation.

  • MA3073000
  • DEDHAM
  • MA
  • 41,630 served

System profile

Source water Purchased surface water
ZIP 02026
EPA system ID MA3073000

Verify this system on EPA ECHO →

Health-based violations, last 10 years
1
Resolved
1
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
0

Key facts

  • Dedham Westwood Water Dist. draws water from 19 wells (3 of them for emergency, seasonal or other part-time use).
  • Most recent formal enforcement: compliance order (no penalty) by Massachusetts, October 2021.
  • Record on file since 1994, with 0 health-based violations before October 19, 2016.
  • Lead pipe inventory: 13 lead and 2,753 unknown out of 12,657 service lines.

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Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant Rule family Start date Status Acute
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
 220 Oct 1, 2021 Resolved No

Full record since 1994

EPA's records for Dedham Westwood Water Dist. go back to 1994. Before October 19, 2016 they list no health-based violations and 2 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 0 2
2020s 1 0

Enforcement actions

Massachusetts regulators took 2 formal enforcement actions against Dedham Westwood Water Dist. and issued 1 ban on new connections between 1994 and 2021. The most recent was a compliance order (no penalty) in October 2021.

Date By Action Violations covered
Oct 25, 2021 Massachusetts Compliance order (no penalty) 1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Jul 16, 1999 Massachusetts Ban on new connections or service extensions 1 violation
Jul 12, 1994 Massachusetts Compliance order (no penalty) 1 violation: Total Coliform

What the violations mean

Total Trihalomethanes (TTHMs)

1 incident

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Where the water comes from

Dedham Westwood Water Dist. draws water from 19 wells (3 of them for emergency, seasonal or other part-time use). It also buys water from MWRA.

Buys water from

Annual water quality report

Dedham Westwood Water Dist. must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Massachusetts.

Certified drinking water labs by state EPA guidance for private wells